Screw-cutter.



A, R. WESZ.

SCREW GUTTER.

APPLICATION HLED JULY9,1907.

9 1 9 ,27 1 Patented Apr, 20, 1909.

l 1 l'l 25 2,; 30 11V A TTOHNE YS UNIT-ED strains rnrnnr onnic ALBERT RICHARD WEISZ, OF NEW YORK, N. YL, ASSIGNOB, TO MATGHLESS CIGAR LIGHTER COMPANY, OF NEW YORK, N. Y.

SGREW-^CUTTER.

Specification of Letters Patent. Ou'ginal application filed April 23, 1906, Serial No. 313,193.

Patented apra eo, 190e. Divided and this application filed July 9, 19o-"1'.

Seria1 No. 382,851.

To all 'whom it may concern:

Be it known that I, ALBERT R. Weisz, a citizen of the United States, and a'resid nt of the city of New York, borough of Brooklyn, in they countybf Kings and State of New York, have invented a new and Improved Screw-Cutter, of which the 'following is a full, clear, and exact description.

This invention is a division of the subject-matter contained in an application tiled by me April 23, 1906, for automatic screw making machine, Serial Number 313,193,

and has for its object to provide a screw cutting device which is simple in construction, effective in operation and durable in use, adapted to be readily sharpened when required, and so constructed as to belcapable of being' accurately adjusted to screws of different diameters.

Other objects relating to the specilic construction and special arrangementof the several parts of my invention will be understood from the following description and accompanying drawings, in which drawings like characters of reference indicate like parts throughout the views, and in which` Figure 1 is side elevation of a device embodying my invention. and operating mechanism connected therewith, the stock supporting the screw cutters being shown in its retracted position; Fig. 2 is a sectional elevation, partlyjbroken away, of the device shown in Fig. 1, showing the screw cutting device arranged in its projected position; Fig. 3 is an end view of the device shown in Fig. 1; 4 is an end view of the device shown in Fig. 2; and Fig. 5 is a sectional elevation of thread cutters mounted' upon jaws pivotally attached to a stock.

As illustrated in the drawings, arc cutters 1 are mounted upon the outer ends of two jaws 2 constituting the die holders, and each jaw is provided near its inner end with an aperture-hinged lug 3. The outer end of .each jaw is provided with a recessed. ,segmental head having an arc rim 4, in which the arc screw cutters are held by means of screws 5 which pivotally attach the ends of the thread cutters to the heads of the jaws. rIhe supporting screws of the cutters are arranged reversely to each other so that the .in said stock.

screw of each cutter is arranged opposite the free end of the opposing cutter. The cutters are provided on theirinner edge with threads 6 andthe free ends of the cutters are faced at an angle to the threads of the cut-ter to form a cutting edge 8, and also to enable the cutting edge to be readily sharpened by simply grinding down the face end of the cutter which extends at an angle to the thread. The threaded portion ot the cutters is preferably cut away so as to recede more abrupt-ly than in a circular line from the free end ot' the cutters, thereby arranging the threads of the cutters eccentrically lto the axis of the cutters and. maku ing a clearance back of the cutting edge formed hy "the beveled free end of the cutters with the threaded portionthereof. Ad justing screws have a threaded engagement with the rim et of the head of thejaws, and at their inner ends bear against the free ends of the cutters, wherebythe cutting edge 8pt said ends of the cutters may be adjuste accurately to cut threads on screws ot' different diameters. The inner ends of the jaws 2 are inserted in the forked outer end D of a stock, which stock is inserted in a sleeve 10, and is. held in piace in the sleeve by means of a screw or pin 11, which passes through Vsaid sleeve and an aperture A pivot pin 12 is passed through the forked end 9 of the stock, and through the apertured lug 3 of the 2, whereby said jaws are pivotally mounted in vthe stock in such a manner that they can swing toward and from each other.

The

jaws are pressed apart' by a helical spring 13 inserted between them and held in place .in an apertured block 1-l formed on the forked'end 9 of the stock. Each jaw is providedvadjacent to its head with a substantially semi-cylindrical shoulder 15 off-set from/the shank of the jaws, and adjacent to said part and toward the hinged end ot1 the jaws with a beveled part 16, and a ring 17 having an inner diameteradapted to engage the oil-set. shoulders 15 soas to surround and embrace the jaws 2. The sleeve 10 is inserted in a socket' 18 formed in the end of a mandrel 19, and is held therein by longitudinal slot 22 is held by a' stud bolt -,23 passing through said slot 22 on the top of a standard 211, and is secured in place on the standard by means of a nut 25. A screw 26 extending in the direction of said arm engages the end of the arm 21 and asses freely through the slot 22, bearing with its free end a ainst the bolt 23, and this screw' is provide with a suitable head, 27 on its outerend. -On the arm 21--ring shaped stops 28 and 29 are held stationary 'by bindin screws 30 and 31 mounted on lugs y32 and 33 of said stops-respectively. vThe mandrel 19 is pivotally'connected at'its outer end with a' link 34;, which in turn may be connected with any suitable means for moving the mandrelA lengthwise in its bearings inthe standards 24 1n one direction. A helical s ring' 35 surrounds said'mandrel between t estandards 2,4, and is held normally in position by means of one of said standards,

a pinv 36, and a key or flat stud 37, the latter being .adapted to slide betweenl one of the standards24 and its cap 38.

When the device ism loperation and the mandrel 19 is 4retracted in itsvbearings in the standards 24 by means of any suitable automatically operating mechanism, the jaws 2 are drawn into the ring 17, which is held in osition by the stop ig. 1 of thev drawing. As the backward pressure on the mandrel 19vis released, the spring 35 projects the mandrel 19 and threaded cutters', bringing the cutters in contact with a rod upon which a thread is to be cut. The spring 35 serves as feeding mechanism for feeding the cutters on said rod, while the rod may be held in a suitable rotating chuck. After the thread has been cut to the desired length, the ring 17 on the jaws comes in contact' with the stop 29 and the feeding tension of the spring 35, forcing the mandrel 19 outward, strips the ring from .the-.jaws of the cutter, thereby permitting the spring 13 between said jaws to separate the jaws from each other and from the rod operated upon. `vAfter the ring 17 has beenstripped from the jaws of the cutter, the mandrel 19 and the jaws supported therein are gradually retracted in the standards 24 and the spring 35 thereby compressed,at the same Vtime the ring 17 is broughtin contact with the stop 28 which arrests the movement of the same, thus forcing thevring up the beveled ysurface 16 of the jaws of the cutters, whereby said jaws are again pressed together and held in closed position ready for the next thread cutting operation. In order to ermit of adjusting the parts according to t e desired length of the screw thread, the nut 25 ,is loosened and the screw 26/turned' the two -pushers '28 and 29.,are in proper-pp@ 28, as illustrated in y tion relatively to the die holding jaws. And the pushers may be adjusted on their supporting arm 21 to regulate lthe extent of 'thread cut on the blank.

Having thus described my invention, what' yI claim as new and desire to secure by Letlengthwise. v

a longitudinal movable mandrel, of pivoted` die holding jaws supported in said mandrel and having rounded shoulders olif-set from the Shanks of said jaws, of a spring ar' ranged between said jaws for pressing them apart, a ring having an inner diameter adapted to receive the oE-set shoulders of said jaws, a supporting arm, stops adjustably secured on said arm at opposite sides of said ring, a standard supporting said arm, and means for adjusting the arm bodily on the standard.

4. In a screw cutter, the combination with a longitudinally movable mandrel, of pivoted die holding jaws supported in said mandrel, each provided with a rounded shoulder off-set from the shank of said jaws, of a spring arranged between said jaws, a ring having an inner diameter adapted to enga e the off-set shoulders of said jaws, alstan ard, an arm mounted on said standard and provided with a longitudinal slot, and stops secured to said arm on opposite sides of said ring. l

5. In a screw cutter, the combination with suitable supports, of a mandrel having a longitudinal. sliding engagement with said supports, a spring connected with said mandrel and adapted to move said mandrel in one direction, pivoted die holding jaws mounted on said mandrel, each jaw being rovided with a rounded shoulder olf set groin the shank of the jaws, a ring having roo an inner diameter adapted to receive the New York and State of New York this 13th shoulders of the jaws, an arm mounted on day of June 1907, f

one of said standards, and stops arranged on opposite sides of said rin'g mounted on said arm, and adjustable relatively to each other.

Signed at New York city,.in the county of l ALBERT RICHARD WEISZ. 

